Sharp 64LHP5000 Service Manual page 72

64LHP5000
PROJECTOR UNIT
Pin No. Pin Name
28 SCL
29 SDA
30 VSS D2
31 VDD D2
32 VDD A1
33 (R-Y)
34 VSS A1
35 VSS A2
36 (B-Y)
37 VDD A2
38 VSS A2
39 Y
40 VDD A3
41 CUR
42 VDD A4
43 C UV
44 REF L UV
Ë TDA8755T (SUB VIDEO ASSY: IC4703)
VIDEO A/D CONVERTER
» Pin Assignment
N.C. 1
REG1 2
INY
3
REG2 4
CLPY
5
6
V
CCA
INU 7
SDN 8
INV 9
AGND 10
CLPU
11
CLPV
12
13
REG3
CE
14
CLP
15
HREF 16
I/O
2
I I C-bus clock line
2
I I c-bus data line
Digital ground 2(0V)
—
— +5V digital supply voltage 2
— +5V analog supply voltage for buffer of DAC 1
O ± (R-Y) output signal (analog signal)
— Analog ground 1(0V)
— Analog ground 2(0V)
O ± (B-Y) output signal (analog colour-difference signal)
— +5V analog supply voltage for buffer of DAC 2
— Analog ground 3 (0V)
O Y output signal (analog luminance signal)
— +5V analog supply voltage for buffer of DAC 3
I Current input for analog output buffers
— Supply and reference voltage for the three DAC S
I Capacitor for chrominance DAC S (high reference)
I Low reference of chrominance DAC S (connected to VSS A1)
» Block Diagram
V V
CCA CCD
32 V
CCD
6
32
31 D7
SUPPLY AND REFERENCE
30 VOLTAGE REGULATOR
D6
29
D5
INY 3
28 D4
CLPY 5
D3
27
CLAMP
CLP 15
26 D2
LOGIC
25 D1
24
D0
INU
7
23 V CCO
22 D'3
CLAMP
11
CLPU
U
21 D'2
CLAMP
20 D'1
CLPV 12
V
19 D'0
18
DGND INV 9
CLK
17
Function
V AGND DGND SDN N.C.
CCO
8
23 10 18 1
TRACK
AND
CLAMP
HOLD
Y
COMPARATOR
16
TRACK
AND
HOLD
TRACK
DIGITAL ANALOG
AND
MULTIPLEXER MULTIPLEXER
HOLD
TRACK
COMPARATOR
AND
128
HOLD
72
REG1 REG2 REG3
2 4
13
8
24
8 8
TTL
8-bit
8-bit
I / O
ADC
PIPELINE
8
31
16
TIMING GENERATOR 14
17
2
19
2
U AND V
8 20
8-bit TTL
DATA 2
ADC I / O
21
ENCODER
2
22
TDA8755
D0
Y
D7
HREF
CE
CLK
D'0
V
D'1
D'2
U
D'3